Dentist&#39;s implement.



No. 769,426. PATENTED SEPT. 6, 1904. L. H. ZERAN.

DENTISTS IMPLEMENT.

APPLIOATION FILED 00T.13, 1903.

N0 MODEL.

Patented September 6, 1904.

UNITED STATES PATENT OFFICE.

LE VlS H. ZERAN, OF ROCKFORD, I()\VA.

DENTISTS IMPLEMENT.

SPECIFICATION forming part of Letters Patent No. 769,426, dated September 6, 1904.

Application filed October 13,1903. Serial No. 176,817. (No model.)

To (1/7] llrhont if ll/1y concern:

Be it known that I, Lnwrs H. ZERAN, a citizen of the United States, residing atRockford, in the county of Floyd and State of Iowa, have invented certain new and useful Improvements in Dentists- Implements, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates to improvements in disk-mandrels designed more particularly for dental purposes, and has for its primary object the provision of a device of this character which is susceptible of ready application to the disks and which will present the least possible obstruction upon the outer surface of the disks.

The invention comprehends a mandrel which may be applied to the disk by the rotation of either in a forward or reverse direction.

Heretofore in this art various types of mandrcls have been employed, prominent among which is a rotary mandrel having a conical threaded end portion adapted to be worked through an aperture of the disk; but such type of mandrel possesses numerous objections, notably the inconvenience and awkwardness of the device in its manipulation by reason of the projecting conical end, which renders the implement more or less liable to injure the teeth of the patient, and further than this the disk can be applied to said old form of mandrel only by turning the same in one direction. The present invention adequately overcomes the foregoing disadvantages.

The novel details in the construction and arrangement of the several parts of the preferable embodiment of my invention will be apparent from the detailed description hereinafter, when read in connection with the accompanying drawings, forming part hereof, and wherein such embodiment is illustrated.

In the drawings, Figure l is a perspective view of the device. Fig. 2 is a longitudinal sectional view thereof. Fig. 3 is an end view; and Fig. -.L is a view similar to Fig. 1, showing a disk applied to the mandrel.

teferring more specifically to the drawings, wherein like reference characters refer to corresponding parts in the several views, A designates the shank or stem of the mandrel adapted to be secured to the flexible rotatable shaft of a dental engine (not necessary to herein show) in any ordinary or preferred manner. The shank A is provided with a substantially annular flat head B, the same having an opening or cut-away portion 1/, at one side thereof, extending from its periphery to substantially the center thereof, the edges of the head being beveled inwardly, as shown, and the oppositely-projecting portions 0 of which are sharpened to constitute noses or guides. These noses or guides are so disposed that either of them may be projected through an aperture in the disk 0, and upon the subsequent turning of the shank A in the proper direction the same will guide the entire head through the disk to the outer surface thereof, it being understood that the shank must be revolved in opposite directions, according to the particular projection entering the disk. To firmly clamp the disk against the head, 1 provide upon the stem A a slidable sleeve D, the same having an angular bore loosely associated with a corresponding angular portion of the stem, (represented at d.) The sleeve just mentioned carries a head E of substantially the same diameter as the head B and has a serrated or roughened surface opposed to the inner surface of said head B. The sleeve is shifted longitudinally of the stem A through the medium of a followernut F, traversing a screw-threaded portion a of said stem.

It will be seen that a disk worked over the head B in the manner aforesaid will be firmly held between the inner surface thereof and the abraded head of the sleeve D by simply advancing the nut .F until the same impinges against the end of the sleeve.

It is to be understood that slight changes and alterations may be made in the particular disclosure set forth herein withoutdeparting from the spirit of the invention. 1 also desire it to be understood that 1 shall in the hereto-appended claims refer to the head B as being "crescent shape, meaning thereby that said head has two projecting portions arranged for the purpose hereinabove stated.

Having thus described the invention, What is claimed as new, and desired to be secured by Letters Patent, is

1. In a disk-mandrel, a stern, a crescent- 5 shaped head on said stern, and means opposing said head for holdinga disk therebetween.

2. In a disk-mandrel, a stern, and a head on said stem' provided With differently-disposed points one arranged to pass through a disk upon rotation in one direction and the other IO arranged, to pass through said disk upon rotation in a reverse direction.

In testimony whereof I affix my signature in presence of tWo Witnesses.

LEWIS H. ZERAN. Witnesses:

A. J ENKINSON, W. E. LONG. 

